Fig. 1. Male-centered (a), female-centered (b) and double-centered (c) biplots of the first and the second principal components for oil yield of four sunflower inbred females and four sunflower inbred males averaged across 11 trial environments of Argentina. In (a), females are represented by points and males by vectors from the origin while in (b) and (c), males are represented by points and females by vectors from the origin.